I had the same WTF reaction because normally the free books I get are full of typos, and eye-rolling plot lines.  Also, I had a giant hangover the first go-around and anything I had read would have made me less miserable. I absolutely loved Enemy.  I got my copy free from Kindle First.  I am now waiting anxiously for the the next installment out on July 16 (I think).   So far it has made my list for the 2017 Hugo awards.  I really, really liked it.  For anyone who hasn't read it, the story